Nozzle for spraying liquid in the form of mist

Abstract

The invention relates to a fluid spray nozzle which is intended to be mounted on a distribution receptacle, the nozzle comprising at least one fluid inlet capillary extending longitudinally along an axis, a supply means to receive the fluid from the at least one inlet capillary in order to supply it to a pillar comprising at least two pipes, the pipes extending longitudinally along the axis A1 and being radially offset relative to the axis, at least two turbulence channels in fluid connection with the at least two pipes, a turbulence chamber for receiving the fluid coming tangentially from the at least two turbulence channels in order to supply at least one spray opening having axial symmetry and a constant cross-section s, the chamber having a cross-section decreasing towards the opening and having a maximum cross-section S and a maximum diameter, the ratio of the cross-section s of the spray opening to the maximum cross-section S of the turbulence chamber is 1%≤s/S≤20%.

1 . A nozzle for spraying a fluid, the nozzle being designed to be mounted on a dispensing container, said nozzle comprising:
 at least one fluid inlet capillary extending longitudinally along an axis A 1 ,   a turbulence chamber for receiving the fluid to be sprayed, said turbulence chamber has a maximum cross-section S and a maximum diameter-D,   at least two conduits that extend longitudinally along said axis and being radially offset from said axis, said conduits in fluid connection with the inlet capillary,   at least two turbulence channels, in fluid connection with said at least two conduits, and connecting said at least two conduits with the turbulence chamber, said at least two conduits thus connecting the inlet capillary to the at least two turbulence channels,   a spray orifice supplied by the turbulence chamber, the spray orifice has axial symmetry and a constant cross-section s, said turbulence chamber has along the axis, a cross-section that decreases towards said spray orifice,   wherein   the ratio of the cross-sectional area s of the spray orifice to the maximum cross-sectional area S of the turbulence field is such that 1%≤ S /S≤20%,   the spray nozzle is operated by means of an actuator independent of the nozzle, and   the inlet capillary has a cross-sectional area that allows a fluid shear rate greater than 5000 s −1 .   
     
     
         2 . The spray nozzle ( 1 ) according to  claim 1 , wherein 1%≤ S /S≤10%. 
     
     
         3 . The spray nozzle according to  claim 1 , wherein the spray orifice has a cylindrical shape with a diameter d and a height h such that: 40% d≤h≤150% d. 
     
     
         4 . The spray nozzle according to  claim 1 , wherein the at least two turbulence channels each have a right-angled quadrilateral cross-section, said cross-section being between 0.001 and 0.06 mm 2 . 
     
     
         5 . The spray nozzle according to  claim 4 , wherein the quadrilateral is a square. 
     
     
         6 . The spray nozzle according to  claim 1 , wherein the supply means comprises
 either a hollow section chamber of generally cylindrical shape, the base of which extends along a plane perpendicular to the axis,   or several supply channels that extend radially on a plane perpendicular to the axis,   in order to supply said at least two conduits.   
     
     
         7 . The spray nozzle according to  claim 1 , wherein the turbulence chamber has a truncated cone shape whose angle α between the axis and the generatrix is such that 25°≤α≤55°. 
     
     
         8 . The spray nozzle according to  claim 1 , wherein the at least two conduits are provided in a pillar, said pillar comprising an enveloping cylinder and having an inner surface Sc, said enveloping cylinder comprising a coaxial spacer whose outer surface is polygonal such that the edges of the spacer are in contact with the inner surface of the enveloping cylinder thereby forming at least three conduits in the pillar. 
     
     
         9 . The spray nozzle according to  claim 1 , wherein the at least one inlet capillary comprises at least two portions each with a constant diameter along its length, each portion with a diameter D equal to or greater than the diameter of at least one downstream portion and each portion with a diameter equal to or less than the diameter of at least one upstream portion. 
     
     
         10 . A medical device suitable for dispensing a fluid and comprising a nozzle according to  claim 1 . 
     
     
         11 . A method of dispensing a rheofluidifying viscous fluid by spraying, wherein the method comprises using the nozzle according to  claim 1 . 
     
     
         12 . The method according to  claim 11 , wherein the distribution is carried out in the form of a mist with homogeneous drops, at least 90% of the drops of the mist having a diameter of less than 100 μm. 
     
     
         13 . The method according to  claim 12 , wherein the distribution is carried out in the form of a mist with homogeneous drops whose median diameter is between 10 μm and 50 μm. 
     
     
         14 . The method according to  claim 12 , wherein the distribution is carried out in the form of a mist with homogeneous drops of which less than 12% of the drops have a diameter of less than 10 μm. 
     
     
         15 . The method according to  claim 11 , wherein the distribution is carried out in the form of a homogeneous mist, the dispersion of the drops of which, characterized by the ratio of the deviation of Dv10 and Dv90 from the median, is less than 2. 
     
     
         16 . The spray nozzle according to  claim 7 , wherein the turbulence chamber has a truncated cone shape whose angle α between the axis and the generatrix is such that 30°≤α≤45°.